If a point satisfying
\left( {\matrix{
\alpha & \beta & \gamma \cr
} } \right)\left( {\matrix{
2 & {10} & 8 \cr
9 & 3 & 8 \cr
8 & 4 & 8 \cr
} } \right) = \left( {\matrix{
0 & 0 & 0 \cr
} } \right)
lies on the plane , then is equal to :